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This partition holds the Boot Configuration Database (BCD), Boot Manager (BOOTMGR), Windows Recovery Environment and reserves space for the startup files which may be required by BitLocker, among which BCD and BOOTMGR are vital parts to start Windows. When installing Windows 7/8/10 on a clean disk which is initialized to MBR, the setup will create a system reserved partition at the beginning of the hard disk and mark it active. What Is System Reserved Partition ( Legacy BIOS + MBR) Tip: Since there are 2 types of booting mode, namely Legacy BIOS + mbr and UEFI + GPT, we talk about this issue from 2 aspects.
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